Hello! I am currently working a game in Java. The only thing is i do not know how to use or implement tile maps. If anyone knows how to or where to learn this please let me know thanks!!!

A tile map is an array of values that represents what's at that location. All you need to do is specify a 2D array and store a bunch of values that each represent a different type of tile. Ex:

0 = empty ground
1 = water
2 = rock

1 1 1 1 1 1 1 1 1 1
1 0 0 0 2 0 0 0 0 1
1 0 0 0 2 0 0 0 0 1
1 0 0 0 2 0 0 0 0 1
1 0 0 0 0 0 0 0 0 1
1 0 0 0 2 0 0 0 0 1
1 0 0 0 2 0 0 0 0 1
1 0 0 0 2 0 0 0 0 1
1 1 1 1 1 1 1 1 1 1

This will look like a wall of rocks with a hole you can get through.

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